Phone prefixes in St-Sauveur, QC

In numbers

In-service prefixes

15

Telephone numbers covered

150,000

Carriers

8

Area codes

3

Provinces and territories

1

First assignment

March 15, 2002

Most recent assignment

March 27, 2025

St-Sauveur’s share of its area codes

Within area code 450, St-Sauveur accounts for only 8 of 775 prefixes (1.0%): the code is dominated by Granby and spread over 129 rate centres. Within area code 579, St-Sauveur accounts for only 6 of 644 prefixes (0.9%): the code is dominated by Granby and spread over 126 rate centres. Within area code 354, St-Sauveur accounts for only 1 of 56 prefixes (1.8%): the code is dominated by Valleyfield and spread over 49 rate centres.

Who holds these numbers

Videotron Ltd. holds the largest share at 4 prefixes, 26.7% of the total, ahead of 7 other carriers. Code by code: in 450, Videotron Ltd. leads with 3 of 8 prefixes ahead of 4 others; in 579, Iristel Inc. leads with 2 of 6 prefixes ahead of 4 others; Cogeco Connexion Inc. is the only holder in 354. No carrier holds prefixes in every one of St-Sauveur’s 3 area codes, while 5 appear in just one.

Wireless and wireline

2 of St-Sauveur’s 15 prefixes (13.3%) are held by carriers whose registered name marks a wireless business: Fido Solutions Inc and Rogers Communications Canada Inc. (Wireless). Wireline prefixes still outnumber them, carried by Videotron Ltd, Bell Canada, Iristel Inc and TELUS Quebec. This is a sort by name, not a licence lookup, and a mobile prefix may have been ported to another network since.

How the allocation was built up

St-Sauveur’s dated assignments run from 2002 to 2025. The busiest period was 2005–2009, when 5 prefixes went to 3 carriers. 2 prefixes (13%) carry no date in the register: these are the historic pre-1999 assignments, the wireline bedrock of the rate centre. Since 2020 another 2 prefixes have been added, so the rate centre is still growing.

St-Sauveur’s oldest prefixes, the ones the register leaves undated, belong to Bell Canada: this carrier made up the landscape before competition arrived. The first dated assignment went to Rogers Communications Canada Inc. (Wireless) in 2002. The most recent arrivals are Cogeco Connexion Inc. (2025), Bell Canada (2016) and ISP Telecom Inc. (2015), a sign that new carriers are still asking for numbers in St-Sauveur.

St-Sauveur has only 15 prefixes, or 150,000 numbers: a small rate centre, where the arrival of a single new carrier visibly changes the landscape.

No single carrier dominates St-Sauveur: the leader, Videotron Ltd., holds only 26.7% of the prefixes against 7 competitors, a sign of a highly fragmented market where cable companies, mobility brands and VoIP providers weigh as much as the incumbent.

Allocation is mature: only 15.4% of the dated prefixes are less than ten years old, most having been handed out in 2005–2009, and 2 prefixes go back to the undated monopoly era. New St-Sauveur numbers mostly come out of blocks that were assigned long ago.

2 undated in the register.

Dialling a St-Sauveur number

St-Sauveur is served by 3 overlaid area codes (450, 579 and 354). A 354 number is no more “out of town” than a 450 one; from abroad, dial +1 and the full ten digits.

The numbering neighbourhood

St-Sauveur shares area codes 450, 579 and 354 with at least 20 other rate centres, including Granby, Joliette, St-Jerome, St-Hyacinthe, Longueuil, Ste-Therese, St-Lambert and Sorel. The largest of them, Granby, holds 52 prefixes in 354, 450 and 579; the smallest on the list, Beloeil, has just 17.

What a St-Sauveur number tells you

A number attached to St-Sauveur tells you that its prefix was issued to a carrier for this rate centre in Quebec, most often Videotron Ltd.. It does not tell you where the handset is today: a subscriber may have ported the number to any of the 8 carriers present here or to a VoIP service usable anywhere. Nor does it tell you who is calling: caller ID can be spoofed, and a Quebec area code is easy to borrow to look local.

Reading a register entry for St-Sauveur: code 450-336 is recorded for Videotron Ltd., so every 450-336-XXXX number (10,000 possible) descends from that assignment. “St-Sauveur, Quebec” there names a rate centre, not a municipality, and several area codes overlay it.

Every St-Sauveur prefix

Each row is an in-service central-office code recorded for St-Sauveur, with its original holder and year of assignment.

Allocated prefixes

All 15 in-service prefixes, grouped by rate centre.

Elsewhere in Quebec